Derivation Web

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## One-sentence thesis

The cited A/B receipts support a specific working claim: longer LTL was associated with higher brain volume (β = 0.43, 95%CI: 0.36-0.50%, p = 0.008, N = 1102); one SD TL decrement-associated hazard ratio of 1.09 (95% CI: 1.06-1.13). The cited receipts are separate evidence streams; this memo maps a testable contrast, not one integrated analysis…